.header-chapter-name,
.header-book-name {
  width: 50%;
  padding-left: 5%;
  padding-right: 5%;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  line-height: 30px;
  text-align: center;
  opacity: 0.3;
  float: left;
}
.header-container,
.footer-container {
  width: 100%;
  height: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.header-container {
  position: absolute;
  top: 3px;
}
.footer-container {
  position: absolute;
  bottom: 5px;
}

.background-page-left,
.background-page-right {
  width: 50%;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  line-height: 30px;
  text-align: center;
  opacity: 0.3;
  float: left;
}
.bookmark {
  height: 40px;
  width: 20px;
  padding: 0px;
  -webkit-transform: rotate(0deg) skew(0deg);
  transform: rotate(0deg) skew(0deg);
  border-left: 10px solid red;
  border-right: 10px solid red;
  border-bottom: 10px solid transparent;
  position: fixed;
  top: 5px;
  right: 70px;
  z-index: 15;
}
.bookmark,
.bookmark:before,
.bookmark:after {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}
.background {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  z-index: -10;
  display: flex;
  justify-content: center;
  align-items: center;
}
